<template>
  <div>    
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <tree-table :data="catelist" 
                :columns="columns"
                :selection-type="false"
                :expand-type="false"
                show-index
                index-text=""
                border
                class="treeTable">
      <!-- 是否有效纵列-->
      <template slot="isok" slot-scope="scope">
        <i class="el-icon-success" 
           v-if="scope.row.cat_deleted ===false"
           style="color:lightgreen"></i>
        <i class="el-icon-error" v-else
          style="color:red"></i>
      </template>
      <!-- 排序纵列 -->
      <template slot="order" slot-scope="scope">
        <el-tag size="mini" v-if="scope.row.cat_level ===0">一级</el-tag>
        <el-tag type="success" size="mini" v-else-if="scope.row.cat_level ===1">二级</el-tag>
        <el-tag type="warning" size="mini" v-else>三级</el-tag>
      </template>
      <!-- 操作纵列 -->
      <template slot="opt" slot-scope="scope">
        <el-button type="primary" @click="showEditCateDialog(scope.row)" icon="el-icon-edit" size="mini">编辑</el-button>
        <el-button type="danger" @click="removeCate(scope.row.cat_id)" icon="el-icon-delete" size="mini">删除</el-button>
      </template>

      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="queryInfo.pagenum"
      :page-sizes="[3, 5, 10, 15]"
      :page-size="queryInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed">
        <el-form :model="addCateForm" 
                 :rules="addCateFormRules" 
                 ref="addCateFormRef" 
                 label-width="100px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类">
            <!-- options用来指定数据源 -->
            <el-cascader
              v-model="selectedKeys"
              :options="parentCateList"
              :props="{
              expandTrigger: 'hover',
              ...cascaderProps,
              checkStrictly: 'true'
            }"
              @change="parentCateChanged"
              clearable>
            </el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button el-button @click="addCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 编辑的对话框 -->
    <el-dialog
      title="修改分类"
      :visible.sync="editCateDialogVisible"
      width="50%">
      <el-form :model="editCate" :rules="editCateRules" ref="editCateRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCate.cat_name"></el-input>
        </el-form-item>
      </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editCateInfo">确 定</el-button>
        </span>
</el-dialog>
    <!-- 删除的对话框 -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 查询条件
      queryInfo:{
        type:3,
        pagenum:1,
        pagesize:5
      },
      // 商品分类的数据列表
      catelist:[],
      // 总数据条数
      total:0,
      // 为table指定列的定义
      columns:[
        {
          label:'分类名称',
          prop:'cat_name'
        },
        {
          label:'是否有效',
          type:'template',
          template:'isok'
        },
        {
          label:'排序',
          type:'template',
          template:'order'
        },
        {
          label:'操作',
          type:'template',
          template:'opt'
        }
        ],
      // 控制  添加分类  按钮的显示隐藏
      addCateDialogVisible:false,
      // 添加分类  的表单的数据对象
      addCateForm:{
        cat_name:'',
        cat_pid:0,
        cat_level:0
        // 添加等级默认为一级分类
      },
      // 添加分类   表单的验证规则对象
      addCateFormRules:{
        cat_name:[
          {required: true,
           message:'请输入分类名称',
           trigger:'blur'}
        ]
      },
      // 父级分类的列表
      parentCateList:[],
      // 指导选择器的配置对象
      cascaderProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      // 选中的父级分类的ID数组
      selectedKeys:[],
      // 编辑分类信息弹框是否可见
      editCateDialogVisible:false,
      editCate:{},
      editCateRules:{
        cat_name: [{ required: true, message: '请输入要修改的信息', trigger: 'blur' }]
      },
      editCateId:'',
      // 删除分类信息弹框是否可见

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品数据
    async getCateList(){
     const {data: res} = await this.$http.get('categories', 
     {params:this.queryInfo})
     if(res.meta.status !== 200){
       return this.$message.error('获取商品数据失败')
     }
     this.catelist = res.data.result
     this.total = res.data.total
    },
    // 监听pagesize和pagenum的改变
    handleSizeChange(newSize){
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage){
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击 添加分类 出现的对话框结果
    showAddCateDialog(){
      // 先获取父级分类的数据列表再展示对话框
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取  添加分类 里父级分类的数据列表
    async getParentCateList(){
     const{data: res} = await this.$http.get('categories',
      {params:{type: 2}})
      if(res.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化触发的函数
    parentCateChanged(){
      console.log(this.selectedKeys);

      if(this.selectedKeys.length > 0){
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length-1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      }else{
        this.addCateForm.cat_pid = 0 
        this.addCateForm.cat_level =0
      }
    },
    // 监听对话框的关闭事件，重置表单
    addCateDialogClosed(){  
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    // 添加分类
    addCate(){
      this.$refs.addCateFormRef.validate(async valid => {
        if(!valid) return 
        const {data: res} = await this.$http.post('categories',this.addCateForm)
        if(res.meta.status !== 201){
          this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功！')
        this.getCateList()
        this.addCateDialogVisible =false
      })
    },
    // 点击编辑按钮展示对话框
    async showEditCateDialog(cateInfo){
      this.editCateId = cateInfo.cat_id
      const {data: res} = await this.$http.get('categories/'+cateInfo.cat_id)
      this.editCate = res.data
      console.log(this.editCate);
      this.editCateDialogVisible =true
    },
    // 编辑分类信息
    async editCateInfo(){
      const {data: res} = await this.$http.put('categories/'+this.editCate.cat_id,
      {cat_name:this.editCate.cat_name})
      if (res.meta.status !== 200) {
        return this.$message.error('更新分类数据失败!')
      }
      this.$message.success('更新分类数据成功！')
      this.getCateList()
      this.editCateDialogVisible = false
    },
    // 点击删除按钮展示对话框
    async removeCate(id){
       const confirmResult =await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('分类删除失败!')
      }
      this.$message.success('该分类已经成功删除!')
      this.getCateList()
    }
  },
}
</script>

<style lang="less" scoped>
.treeTable{
  margin-top: 15px;
}
</style>